Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie
Q 57.105: Poster
Donnerstag, 17. März 2011, 16:30–19:30, P1
Towards an optical lattice-based magnesium frequency standard — •Klaus Zipfel, Matthias Riedmann, Jan Friebe, Hrishikesh Kelkar, Temmo Wübbena, Andre Kulosa, Andre Pape, Dominika Fim, Wolfgang Ertmer, and Ernst Maria Rasel — Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover
Optical atomic clocks have large potential regarding accuracy and stability compared to the best microwave clocks. Alkaline-earth magnesium (Mg) is an interesting candidate for a future neutral atom optical clock because of its low sensitivity to blackbody radiation, which is currently limiting the accuracy of state-of-the-art Sr lattice clocks.
At the magic wavelength of Mg, which has been predicted to be at 463 nm, the differential AC-Stark shift of the strictly forbidden 1S0 → 3P0 clock transition cancels out. Furthermore, the tight confinement of the atoms in the lattice will enable us to reach the Lamb-Dicke regime, allowing first order Doppler-free spectroscopy.
As a precursor, we loaded Mg atoms in an optical dipole trap at 1064 nm. Using a continuous loading scheme, we reach up to 105 atoms at an average temperature of 100 µK. Currently, we investigate to create an optical lattice inside an optical resonator to enhance the trap depth and the loading of this lattice.